Swiss Bird Index®
Birds arise in a wide variety of very different natural habitats, but most often have specific requirements of their habitat. Hence, breeding bird populations are a valuable indicator of the state of biodiversity in general. In the short term, population trend is dependent on weather conditions and other random fluctuations. The observation of long-term trends enables conclusions to be drawn about the success of measures implemented for the conservation of species, changes in their habitats and the impact of harmful factors.
The trend for all bird species that breed regularly in Switzerland has been balanced over the last 30 years. In contrast, the development of the 42 Red List species, which account for almost one quarter of Swiss breeding bird species, continues to decline. Since 1990, these species have declined by more than 40%.
The assessment concerns only the development of Red List species as these species are more likely to become extinct and measures for their conservation are a priority as a result.
More information about the state of Birds in Switzerland.
The indicator is similar to the “Common Bird Index” of the Pan-European Common Bird Monitoring (PECBM). However the two indices differ in relation the number and selection of the bird species considered.
The Swiss Bird Index® is calculated by the Swiss Ornithological Institute Sempach. It provides regular information about the changes in the populations of breeding bird species found in Switzerland. These include bird species which have brooded in Switzerland in at least nine consecutive years out of ten since 1990 (excluding birds that have been introduced and escaped from captivity). The population in 1990 was defined as the index value of 100.
The evolution of all bird species that breed regularly in Switzerland and those featuring on the Red List are included in the Index. As one of key indicators, the Swiss Bird Index is used for the federal authorities’ monitoring of sustainable development in Switzerland (Monitoring Nachhaltiger Entwicklung, MONET).
|Targeted trend||Initial value||Final value||Variation in %||Observed trend||Assessment|
|Stabilisation||Average 1990-1992||Average 2016-2018||-41.55%||Decrease||negative|
|Basis: Thereof Red List species (42 species)|